LINKSYS HGA5S-3 Wireless-G VPN Broadband Router User Manual Book

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Document ID	489901
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Document Description	Users Manual Part 3
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Document Type	User Manual
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Filesize	290.95kB (3636847 bits)
Date Submitted	2004-11-19 00:00:00
Date Available	2004-11-19 00:00:00
Creation Date	2004-11-17 18:10:48
Producing Software	Acrobat Distiller 5.0.5 (Windows)
Document Lastmod	2004-11-17 18:11:09
Document Title	Book Template.book
Document Creator	FrameMaker 7.0
Document Author:	rebecca

Wireless-G VPN Broadband Router
VPN
Virtual Private Networking (VPN) is a security measure that basically creates a secure connection between two
remote locations. This connection is very specific as far as its settings are concerned; this is what creates the
security. The VPN screen, shown in Figure 6-17, allows you to configure your VPN settings to make your network
more secure.
VPN PassThrough
• IPSec Passthrough. Internet Protocol Security (IPSec) is a suite of protocols used to implement secure
exchange of packets at the IP layer. To allow IPSec Passthrough, click the Enabled button. To disable IPSec
Passthrough, click the Disabled button.
• PPTP Pass Through. Point-to-Point Tunneling Protocol Passthrough is the method used to enable VPN
sessions to a Windows NT 4.0 or 2000 server. To allow PPTP Passthrough, click the Enabled button. To
disable PPTP Passthrough, click the Disabled button.
• L2TP Pass Through. Layering 2 Tunneling Protocol Passthrough is an extension of the Point-to-Point
Tunneling Protocol (PPTP) used by to enable the operation of a virtual private network (VPN) over the
Internet.To allow L2TP Passthrough, click the Enabled button. To disable L2TP Passthrough, click the
Disabled button.
VPN Tunnel
The VPN Router creates a tunnel or channel between two endpoints, so that the data or information between
these endpoints is secure.
Figure 6-17: VPN
• To establish this tunnel, select the tunnel you wish to create in the Select Tunnel Entry drop-down box. It is
possible to create up to 50 simultaneous tunnels. Then click Enabled to enable the tunnel. Once the tunnel
is enabled, enter the name of the tunnel in the Tunnel Name field. This is to allow you to identify multiple
tunnels and does not have to match the name used at the other end of the tunnel.
• Local Secure Group and Remote Secure Group. The Local Secure Group is the computer(s) on your LAN that
can access the tunnel. The Remote Secure Group is the computer (s) on the remote end of the tunnel that can
access the tunnel. Enter the IP Address and Subnet Mask of the local VPN Router in the fields. To allow
access to the entire IP subnet, enter 0 for the last set of IP Addresses. (e.g. 192.168.1.0).
• Remote Security Gateway. The Remote Security Gateway is the VPN device, such as a second VPN Router, on
the remote end of the VPN tunnel. Enter the IP Address of the VPN device at the other end of the tunnel. The
remote VPN device can be another VPN Router, a VPN Server, or a computer with VPN client software that
supports IPSec. The IP Address may either be static (permanent) or dynamic (changing), depending on the
Chapter 6: Configuring the Router
The Security Tab
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Wireless-G VPN Broadband Router
settings of the remote VPN device. Make sure that you have entered the IP Address correctly, or the
connection cannot be made. Remember, this is NOT the IP Address of the local VPN Router, but the IP
Address of the remote VPN Router or device with which you wish to communicate.
• Encryption. Using Encryption also helps make your connection more secure. There are two different types of
encryption: DES or 3DES (3DES is recommended because it is more secure). You may choose either of these,
but it must be the same type of encryption that is being used by the VPN device at the other end of the tunnel.
Or, you may choose not to encrypt by selecting Disable. In Figure 6-18, DES (which is the default) has been
selected.
• Authentication. Authentication acts as another level of security. There are two types of authentication: MD5
and SHA (SHA is recommended because it is more secure). As with encryption, either of these may be
selected, provided that the VPN device at the other end of the tunnel is using the same type of authentication.
Or, both ends of the tunnel may choose to Disable authentication. In Figure 6-18, MD5 (the default) has been
selected.
• Key Management. Key Exchange Method. Select Auto (IKE) or Manual for the Key Exchange Method. The
two methods are described below.
Auto (IKE)
Select Auto (IKE) and enter a series of numbers or letters in the Pre-shared Key field. Check the box next to
PFS (Perfect Forward Secrecy) to ensure that the initial key exchange and IKE proposals are secure. Based on
this word, which MUST be entered at both ends of the tunnel if this method is used, a key is generated to
scramble (encrypt) the data being transmitted over the tunnel, where it is unscrambled (decrypted). You may
use any combination of up to 24 numbers or letters in this field. No special characters or spaces are allowed.
In the Key Lifetime field, you may optionally select to have the key expire at the end of a time period of your
choosing. Enter the number of seconds you’d like the key to be useful, or leave it blank for the key to last
indefinitely.
Manual (See Figure 6-18.)
Select Manual, then select the Encryption Algorithm from the drop-down menu. Enter the Encryption Key in
the field (If, for your Encryption Algorithm, you chose DES, enter 16 hexadecimal characters. If you chose
3DES, enter 48 hexadecimal characters.) Select the Authentication Algorithm from the drop-down menu.
Enter the Authentication Key in the field (If, for your Authentication Algorithm, you chose MD5, enter 32
hexadecimal characters. If you chose SHA1, enter 40 hexadecimal characters.) . Enter the Inbound and
Outbound SPIs in the respective fields.
• Status. Click the Advanced VPN Tunnel Setup key and the Advanced VPN Tunnel Setup screen will appear.
See Figure 6-20.
Chapter 6: Configuring the Router
The Security Tab
Figure 6-18: Manual Key Management
33
Wireless-G VPN Broadband Router
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes. Advanced VPN Tunnel Setup
From the Advance VPN Tunnel Setup screen, shown in Figure 6-19, you can adjust the settings for specific VPN
tunnels.
Phase 1
• Phase 1 is used to create a security association (SA), often called the IKE SA. After Phase 1 is completed,
Phase 2 is used to create one or more IPSec SAs, which are then used to key IPSec sessions.
• Operation Mode. There are two modes: Main and Aggressive, and they exchange the same IKE payloads in
different sequences. Main mode is more common; however, some people prefer Aggressive mode because it
is faster. Main mode is for normal usage and includes more authentication requirements than Aggressive
mode. Main mode is recommended because it is more secure. No matter which mode is selected, the VPN
Router will accept both Main and Aggressive requests from the remote VPN device.
• Encryption. Select the length of the key used to encrypt/decrypt ESP packets. There are two choices: DES and
3DES. 3DES is recommended because it is more secure.
• Authentication. Select the method used to authenticate ESP packets. There are two choices: MD5 and SHA.
SHA is recommended because it is more secure.
Figure 6-19: Advanced VPN Tunnel Setup
• Group. There are two Diffie-Hellman Groups to choose from: 768-bit and 1024-bit. Diffie-Hellman refers to a
cryptographic technique that uses public and private keys for encryption and decryption.
• Key Life Time. In the Key Lifetime field, you may optionally select to have the key expire at the end of a time
period of your choosing. Enter the number of seconds you’d like the key to be used until a re-key negotiation
between each endpoint is completed.
Phase 2
• Encryption. The encryption method selected in Phase 1 will be displayed.
• Authentication. The authentication method selected in Phase 1 will be displayed.
• Group. There are two Diffie-Hellman Groups to choose from: 768-bit and 1024-bit. Diffie-Hellman refers to a
cryptographic technique that uses public and private keys for encryption and decryption.
• Key Life Time. In the Key Lifetime field, you may optionally select to have the key expire at the end of a time
period of your choosing. Enter the number of seconds you’d like the key to be used until a re-key negotiation
between each endpoint is completed.
Chapter 6: Configuring the Router
The Security Tab
34
Wireless-G VPN Broadband Router
Other Options
• Unauthorized IP Blocking. Click Enabled to block unauthorized IP addresses. Enter in the Rejects Number
field to specify how many times IKE must fail before blocking that unauthorized IP address. Enter the length of
time that you specify (in seconds) in the Block Period field.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes. For further help on this tab, click the Help button.
Security
802.1x (See Figure 6-20.)
• Radius Server IP Address. Enter the Radius Server IP Address in the fields.
• Radius Server Port. Enter the Radius Server Port in the field.
• Shared Secret. Enter the Shared Secret in the field.
• Authentication Type. To enable EAP-TLS, click EAP-TLS. To enable EAP-TTLS, click EAP-TTLS. To enable EAPMD5, click EAP-MD5,. To disable authentication, click Disable.
• WEP Settings. Click the WEP Settings button to edit the settings and Figure 7-22 will appear.
• Dynamic WEP Key Length. Select 64 or 128 bits from the drop-down menu.
• Key Renewal Timeout. Enter the time in seconds for key renewal.
• Port Inactivity Timeout. Enter the time in seconds for port inactivity.
• Port Connectivity Timeout. Enter the time in seconds for port connectivity.
Figure 6-20: 802.1x
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
WEP
The WEP screen allows you to configure your WEP settings. (See Figure 6-21.) WEP encryption should always be
enabled to increase the security of your wireless network. Default Transmit Key. Select which WEP key (1-4) will
be used when the Router sends data. Make sure that the receiving device is using the same key.
Chapter 6: Configuring the Router
The Security Tab
35
Wireless-G VPN Broadband Router
• WEP Encryption. Select the level of WEP encryption you wish to use, 64-bit 10 hex digits or 128-bit 26 hex
digits. Higher encryption levels offer higher levels of security, but due to the complexity of the encryption,
they may decrease network performance.
• Passphrase. Instead of manually entering WEP keys, you can enter a Passphrase. This Passphrase is used to
generate one or more WEP keys. It is case-sensitive and should not be longer than 16 alphanumeric
characters. (This Passphrase function is compatible with Linksys wireless products only. If you want to
communicate with non-Linksys wireless products, enter the WEP key manually on the non-Linksys wireless
products.) After you enter the Passphrase, click the Generate button to create WEP keys.
• Keys 1-4. WEP keys enable you to create an encryption scheme for wireless LAN transmissions. If you are not
using a Passphrase, then manually enter a set of values. (Do not leave a key field blank, and do not enter all
zeroes. These are not valid key values.)
If you are using 64-bit WEP encryption, then the key must be exactly 10 hexadecimal characters in length. If
you are using 128-bit WEP encryption, then the key must be exactly 26 hexadecimal characters in length.
Valid hexadecimal characters are “0”-“9” and “A”-“F”.
Figure 6-21: WEP
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
The Access Restrictions Tab
Access Restriction
The Access Restrictions tab, shown in Figure 6-22, allows you to block or allow specific kinds of Internet usage.
You can set up Internet access policies for specific PCs and set up filters by using network port numbers.
• Internet Access Policy. Multiple Filters can be saved as Internet Access Policies. When you wish to edit one,
select the number of the Policy from the drop-down menu. The tab will change to reflect the settings of this
Policy. If you wish to delete this Policy, click the Delete button. To see a summary of all Policies, click the
Summary button.
The summaries are listed on this screen, shown in Figure 7-23, with their name and settings. To return to the
Filters tab, click the Close button.
• Enter Policy Name. Policies are created from the fields presented here.
To create an Internet Access policy:
1. Enter a Policy Name in the field provided. Select Internet Access as the Policy Type.
Chapter 6: Configuring the Router
The Access Restrictions Tab
Figure 6-22: Access Restriction
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Wireless-G VPN Broadband Router
2. Click the Edit List button. This will open the List of PCs screen, shown in Figure 6-24. From this screen, you
can enter the IP address or MAC address of any PC to which this policy will apply. You can even enter ranges
of PCs by IP address. Click the Apply button to save your settings, the Cancel button to undo any changes,
and the Close button to return to the Filters tab.
3. If you wish to Deny or Allow Internet access for those PCs you listed on the List of PCs screen, click the
option.
4. You can filter access to various services accessed over the Internet, such as FTP or Telnet, by selecting a
service from the drop-down menus next to Blocked Services. If a service isn’t listed, you can click the Add
Service button to open the Service screen, shown in Figure 6-25, and add a service to the list. You will need
to enter a Service name, as well as the Protocol and Port Range used by the service.
Figure 6-23: Internet Filter Summary
5. By selecting the appropriate setting next to Days and Time, choose when Internet access will be filtered.
6. Lastly, click the Save Settings button to activate the policy.
To create an Inbound Traffic Policy
1. Enter a Policy Name in the field provided. Select Inbound Traffic as the Policy Type.
2. Enter the IP Address from which you want to block. Select the Protocol: TCP, UDP, or Both. Enter the port
number or select Any. Enter the IP Address to which you want to block.
3. Select Deny or Allow as appropriate.
4. By selecting the appropriate setting next to Days and Time, choose when the Inbound Traffic will be filtered.
Lastly, click the Save Settings button to activate the policy.
Figure 6-24: List of PCs
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Internet Access can also be filtered by URL Address, the address entered to access Internet sites, by entering the
address in one of the Website Blocking by URL Address fields. If you do not know the URL Address, filtering can
be done by Keyword by entering a keyword in one of the Website Blocking by Keyword fields.
Figure 6-25: Blocked Services
Chapter 6: Configuring the Router
The Access Restrictions Tab
37
Wireless-G VPN Broadband Router
The Applications and Gaming Tab
Port Range Forwarding
The Port Forwarding screen sets up public services on your network, such as web servers, ftp servers, e-mail
servers, or other specialized Internet applications. (Specialized Internet applications are any applications that use
Internet access to perform functions such as videoconferencing or online gaming. Some Internet applications
may not require any forwarding.) (See Figure 6-26.)
When users send this type of request to your network via the Internet, the Router will forward those requests to
the appropriate PC. Any PC whose port is being forwarded must have its DHCP client function disabled and must
have a new static IP address assigned to it because its IP address may change when using the DHCP function.
• Application. Enter the name you wish to give each application.
• Start and End. Enter the starting and ending numbers of the port you wish to forward.
• Protocol. Select the type of protocol you wish to use for each application: TCP, UDP, or Both.
• IP Address. Enter the IP Address and Click Enabled.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Chapter 6: Configuring the Router
The Applications and Gaming Tab
Figure 6-26: Port Range Forwarding
38
Wireless-G VPN Broadband Router
Port Triggering
Port Triggering is used for special Internet applications whose outgoing ports differ from the incoming ports. For
this feature, the Router will watch outgoing data for specific port numbers. (See Figure 6-27.) The Router will
remember the IP address of the computer that sends a transmission requesting data, so that when the requested
data returns through the Router, the data is pulled back to the proper computer by way of IP address and port
mapping rules.
• Application. Enter the name you wish to give each application.
• Start Port and End Port. Enter the starting and ending Triggered range numbers and the Forwarded Range
numbers of the port you wish to forward.
• Protocol. Select the type of protocol you wish to use for each application: TCP, UDP, or Both.
• Click Enabled.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Figure 6-27: Port Triggering
Chapter 6: Configuring the Router
The Applications and Gaming Tab
39
Wireless-G VPN Broadband Router
UPnP Forwarding
The UPnP screen provides options for customization of port services for applications. (See Figure 6-28.)
Enter the Application in the field. Then, enter the External and Internal Port numbers in the fields. Select the type
of protocol you wish to use for each application: TCP, UDP, or Both. Enter the IP Address in the field. Click
Enabled to enable UPnP Forwarding for the chosen application.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Figure 6-28: UPnP Forwarding
Chapter 6: Configuring the Router
The Applications and Gaming Tab
40
Wireless-G VPN Broadband Router
DMZ
The DMZ screen (see Figure 6-29) allows one local user to be exposed to the Internet for use of a special-purpose
service such as Internet gaming and videoconferencing, through Software DMZ, or a user can use LAN Port 4 as a
DMZ Port, through Hardware DMZ. Whereas Port Range Forwarding can only forward a maximum of 10 ranges of
ports, DMZ hosting forwards all the ports for one PC at the same time.
• Software DMZ. This feature allows one local user to be exposed to the Internet for use of a special-purpose
service such as Internet gaming and videoconferencing. To use this feature, select Enabled. To disable DMZ ,
select Disabled.
• DMZ Host IP Address. To expose one PC, enter the computer’s IP address. To get the IP address of a
computer, refer to “Appendix D: Finding the MAC Address and IP Address for Your Ethernet Adapter.”
Deactivate DMZ by entering a 0 in the field.
• Hardware DMZ. This feature allows a user to use LAN Port 4 as a DMZ Port. To use this feature, select
Enabled. To disable DMZ , select Disabled.
• Hardware DMZ IP Address. Enter the IP Address of the computer in the fields.
• Hardware DMZ Netmask. Enter the Netmask in the fields.
• Destination IP Address. Enter the IP Address of the destination in the fields.
Figure 6-29: DMZ
• Subnet Mask. Enter the Subnet Mask of the destination in the fields.
• Default Gateway. Enter the Default Gateway in the fields.
• metric. Enter the metric in the field.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Chapter 6: Configuring the Router
The Applications and Gaming Tab
41
Wireless-G VPN Broadband Router
The Administration Tab
Management
The Management screen, shown in Figure 6-30, allows you to change the Router’s access settings as well as
configure the SNMP and UPnP (Universal Plug and Play) features.
Router Password
Local Router Access. To ensure the Router’s security, you will be asked for your password when you access the
Router’s Web-based Utility. The default password is admin.
• User Name. Enter the default admin.
• Router Password. It is recommended that you change the default password to one of your choice.
• Re-enter to confirm. Re-enter the Router’s new Password to confirm it.
Remote Router Access. This feature allows you to access the Router from a remote location, via the Internet.
• Remote Management. This feature allows you to manage the Router from a remote location, via the Internet.
To enable Remote Management, click Enabled.
• Mangagement Port. Select the port number you will use to remotely access the Router from the drop-down
menu.
SNMP
Simple Network Management Protocol (SNMP) is a popular network monitoring and management protocol. To
enable SNMP, click Enabled. To disable SNMP, click Disabled.
Figure 6-30: Management
• Identification. In the Contact field, enter contact information for the Router. In the Device Name field, enter the
name of the Router. In the Location field, specify the area or location where the Router resides.
• Get Community. Enter the password that allows read-only access to the Router’s SNMP information.
• Set Community. Enter the password that allows read/write access to the Router’s SNMP information.
• SNMP Trusted Host. You can restrict access to the Router’s SNMP information by IP address. Enter the IP
address in the SNMP Trusted Host field. If this field is left blank, then access is permitted from any IP address.
Chapter 6: Configuring the Router
The Administration Tab
42
Wireless-G VPN Broadband Router
• SNMP Trap-Community. Enter the password required by the remote host computer that will receive trap
messages or notices sent by the Router.
• SNMP Trap-Destination. Enter the IP address of the remote host computer that will receive the trap
messages.
UPnP
UPnP allows Windows XP to automatically configure the Router for various Internet applications, such as gaming
and videoconferencing. To enable UPnP, click Enabled.
• Allow User to make Configuration Changes. When enabled, this feature allows you to make manual changes
while still using the UPnP feature.
• Allow users to disable Internet access. When enabled, this feature allows you to prohibit any and all Internet
connections.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Log
The Log tab, shown in Figure 6-31, provides you with a log of all incoming and outgoing URLs or IP addresses for
your Internet connection.
Email Alert
To enable E-Mail Alert, click Enabled.
• E-Mail Address for General Logs. Enter the E-Mail Address for General Logs in the field.
• E-Mail Address for Alert Logs. Enter the E-Mail Address for Alert Logs in the field.
• Return E-Mail address. Enter the address for the return E-Mail.
• E-Mail Server IP Address. Enter the IP Address of the E-Mail Server in the fields.
Syslog Notification
To enable Syslog, click Enabled.
• Device Name. Enter the Device Name in the field.
Chapter 6: Configuring the Router
The Administration Tab
Figure 6-31: Log
43
Wireless-G VPN Broadband Router
• Syslog Server IP Address. Enter the IP Address of the Syslog Server.
• Syslog Priority. Select the priority from the drop-down list.
Notification Queue Length
• Log queue Length. Enter the number of entries in the log queue in the field.
• Log Time Threshold. Enter the time for the threshold in the field.
Alert Log
Select the type of attacks that you want to be alerted to. Select Syn Flooding, IP Spoofing, Win Nuke, Ping of
Death, or Unauthorized Login attempt.
General Log.
Select the type of activity you would like to log. Select System Error Messages, Deny Policies, Allow Policies,
Content Filtering, Data Inspection, authorized Login, or Configuration Changes.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Diagnostics
Ping Test (See Figure 6-32.)
Ping Test Parameters
Ping Target IP. Enter the IP Address that you want to ping in the field.
No. of Pings. Enter the number of times that you want to ping.
Ping Size. Enter the size of the ping packets.
Ping Interval. Enter the ping interval in Milliseconds.
Ping Timeout. Enter the time in Milliseconds.
Figure 6-32: Ping Test
Click the Start Test button to start the Ping Test. Click the Abort Test button to stop the test. Click the Clear
Result button to clear the results. The results of the test will display in the window.
Chapter 6: Configuring the Router
The Administration Tab
44
Wireless-G VPN Broadband Router
Factory Default (See Figure 6-33.)
If you have exhausted all other options and wish to restore the Router to its factory default settings and lose all
your settings, click Yes.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Figure 6-33: Factory Default
Firmware Upgrade (See Figure 6-34.)
To upgrade the Router’s firmware:
1. Click the Browse button to find the firmware upgrade file that you downloaded from the Linksys website and
then extracted.
2. Double-click the firmware file you downloaded and extracted. Click the Upgrade button, and follow the
instructions there.
Figure 6-34: Firmware Upgrade
Chapter 6: Configuring the Router
45
Wireless-G VPN Broadband Router
Status
Router
This screen displays information about your Router and its WAN (Internet) Connections. (See Figure 6-35.)
Information
The information displayed is the Hardware Version, Software Version, MAC Address, Local MAC Address, and
System Up Time.
WAN Connections
The WAN Connections displayed are the Network Access, WAN IP Address, Subnet Mask, Default Gateway, and
DNS.
Click the Refresh button if you want to Refresh your screen.
Figure 6-35: Router
Chapter 6: Configuring the Router
Status
46

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